# 5.5
alien_color = 'green'
if alien_color == 'green':
    print('You win 5 points!')  # 执行此句
elif alien_color == 'yellow':
    print('You win 10 points!')
else:
    print('You win 15 points!')

alien_color = 'yellow'
if alien_color == 'green':
    print('You win 5 points!')
elif alien_color == 'yellow':
    print('You win 10 points!') # 执行此句
else:
    print('You win 15 points!')

alien_color = 'red'
if alien_color == 'green':
    print('You win 5 points!')
elif alien_color == 'yellow':
    print('You win 10 points!')
else:
    print('You win 15 points!') # 执行此句